Update age requirement clarification in terms of service

[jackxu0302]

Clarified the age requirement for GitHub accounts to specify that the minimum age may vary by country. If younger than 13 use that if older use that

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What's being changed (if available, include any code snippets, screenshots, or gifs):

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• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
site-policy/github-terms/github-terms-of-service.md	fpt	fpt

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[margaret-tucker]

LGTM - anything in particular that motivated this change or just clarification/improvement? Recommend flagging to @literarytea for awareness as the age requirements are a hot issue.

[jackxu0302]

under the BC law you do not need to be 13 linked PIPA and infants act as a reminder infants act:https://www.bclaws.gov.bc.ca/civix/document/id/complete/statreg/96223_01#part1 PIPA :https://www.bclaws.gov.bc.ca/civix/document/id/complete/statreg/00_03063_01#part3

[khxu]

Thanks @jackxu0302, we'll need to check in with our attorneys for changes to the Terms of Service, so I'll close this PR and we'll re-open if they're supportive of this change